why is it necessary to harness alternative sources of energy? justify
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it is necessary to harness alternative sources of energy as coal,petroleum,diesel are non renewable sources . they take time to form.hence it is necessary to use renewable sources of energy like solar energy,wind energy,hydroelectricity etc
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Explanation:
Zero times means initial time and the body is at rest
Positive time means the body is moving in positive direction
Negative time means the body is moving in negative direction not the time is negative
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